Patent application number | Description | Published |
20090145217 | TRIGGER UNIT MOUNTING STRUCTURE FOR WHEEL POSITION DETECTION SYSTEM - A first trigger unit and a second trigger unit output trigger signals to transceivers disposed for the four wheels of a vehicle. The first and second trigger units are attached to wall surfaces of tire housings corresponding to the left front and left rear wheels respectively. Each of the first and second trigger units is arranged in a position of the wall surface having an angle from 5 to 25 degrees with respect to the side of the corresponding wheel. Transceivers attached to a right front and right rear wheels are thus located farther from the trigger units than the left front and left rear wheels, respectively. Such arrangement allows the transceivers attached to the right front and right rear wheels to receive the outputted trigger signals with sufficient accuracy due to high field strength. | 06-11-2009 |
20120319831 | WHEEL POSITION IDENTIFYING DEVICE, TRANSMITTER USED FOR THE SAME, AND TIRE PRESSURE DETECTING APPARATUS HAVING THE SAME - In a wheel position identifying device for a vehicle, transmitters are disposed in wheels, respectively. Each of the transmitters has a dual axis acceleration sensor and a control unit. The dual axis acceleration sensor detects a normal-direction acceleration and a tangential-direction acceleration of the wheel associated with the transmitter. The control unit determines whether the wheel associated with the transmitter is a right wheel or a left wheel based on a sign of a product of a time differential value of the normal-direction acceleration and the tangential-direction acceleration, and stores data regarding a determination result in a frame. A receiver receives the frame from each transmitter and identifies a position of the transmitter based on the data stored in the frame. The wheel position identifying device is for example employed to a tire pressure detecting apparatus. | 12-20-2012 |
20130222128 | Tire Pressure Detecting Apparatus Having Wheel Position Detection Function - In a tire pressure detecting apparatus, a receiver stores wheel positions detected by a previous wheel position detection as previous wheel positions. When an ignition switch is turned on and until wheel positions are newly specified by a current wheel position detection, the receiver permits an indicator to indicate tire pressure of each of wheels based on the previous wheel positions to notify a driver of the tire pressure from an earlier timing. The receiver permits the indication of the tire pressure based on the previous wheel positions only when a difference of the tire pressure between the wheels is equal to or less than a threshold. If there is a possibility that tire pressure of one of the wheels is insufficient, the receiver prevents the indicator to indicate the tire pressure until a current wheel position detection finishes. | 08-29-2013 |
20140340213 | WHEEL POSITION DETECTOR AND TIRE INFLATION PRESSURE DETECTOR HAVING THE SAME - A wheel position detector for a vehicle includes: a transmitter at each wheel having a first controller for generating and repeatedly transmitting a frame with specific identification information and an acceleration sensor; a receiver at a vehicle body receiving the frame from one wheel and having a second controller for performing wheel position detection; and a wheel speed sensor for detecting a tooth of a gear. The second controller acquires gear information indicating a tooth position; sets a variation allowance based on the tooth position; registers the one wheel with using the variation allowance; sets another variation allowance based on another tooth position when the receiver receives a new frame; and changes the variation allowance to a new variation allowance provided by an overlap portion between the variation allowance and another variation allowance. | 11-20-2014 |
20140365162 | WHEEL POSITION DETECTING DEVICE AND TIRE PRESSURE DETECTING APPARATUS HAVING THE SAME - In a wheel position detecting device, a transmission angular position of a transmitter to transmit a frame from the transmitter to a receiver is changed by a predetermined angle each time the transmitter transmits the frame. A receiver acquires gear information indicating a tooth position of a gear rotating in association with a corresponding wheel, based on a detection signal of a wheel speed sensor. The receiver specifies to which wheels the transmitter is integrated, based on the tooth position of the gear at a reception timing of the frame. | 12-11-2014 |
20140371980 | WHEEL POSITION DETECTOR AND TIRE INFLATION PRESSURE DETECTOR HAVING THE SAME - In a wheel position detector for a vehicle, a transmitter on each wheel repeatedly transmits a data frame containing identification information when an angle of the transmitter reaches a transmission angle. A receiver for receiving the frame is mounted on a body of a vehicle and performs wheel position detection, based on the frame, to specify a target wheel from which the frame is transmitted. The receiver acquires a tooth position of a gear rotating with a corresponding wheel when receiving the frame. The receiver specifies the target wheel based on a frequency with which the tooth position appears. | 12-18-2014 |
20140372070 | WHEEL POSITION DETECTOR AND TIRE INFLATION PRESSURE DETECTOR HAVING THE SAME - A wheel position detector for a vehicle includes: a transmitter at each wheel having a first control portion for generating and transmitting a frame with specific identification information; and a receiver at a vehicle body receiving the frame from one wheel and having a second control portion for performing wheel position detection; and a wheel speed sensor for detecting a tooth of a gear. The second control portion: acquires gear information indicating a tooth position; corrects the tooth position based on a time difference between acquiring of the gear information and receiving time of the frame; and specifies the one wheel based on the tooth position at reception time. | 12-18-2014 |
20140379291 | WHEEL POSITION DETECTOR AND TIRE INFLATION PRESSURE DETECTOR HAVING THE SAME - In a wheel position detector for a vehicle, a transmitter on each wheel repeatedly transmits a data frame containing identification information when an angle of the transmitter reaches a transmission angle. A receiver for receiving the frame is mounted on a body of a vehicle and performs wheel position detection based on the frame to specify a target wheel from which the frame is transmitted. The receiver acquires a tooth position of a gear rotating with a corresponding wheel when receiving the frame and sets a variation allowable range based on the tooth position. The receiver specifies the target wheel by determining whether the tooth position falls within the variation allowable range. The transmitter changes the transmission angle at a predetermined time interval. | 12-25-2014 |
20150020584 | WHEEL POSITION DETECTOR AND TIRE INFLATION PRESSURE DETECTOR HAVING THE SAME - A wheel position detector for a vehicle includes: a transmitter at each wheel having a first control portion for transmitting a frame with specific identification information; and a receiver at a vehicle body receiving the frame from one wheel and having a second control portion for performing wheel position detection; and a wheel speed sensor for detecting a tooth of a gear. The second control portion: acquires gear information indicating a tooth position; sets a variation allowance based on the tooth position; registers the one wheel with using the variation allowance; and performs the wheel position detection by excluding an identified wheel as the one wheel from a candidate of another wheel mounting the transmitter that transmits another frame when the second control portion identifies the one wheel. | 01-22-2015 |